Surfacing tool



- Jan. 5 1926.

G. A. OLIN SURFACNG TOOL Filed April 25, 1924 Nw 8, jv @n .ww mw N mi m..Q a R m\\\\\\\ VV u ///7w///// rd. f e .N QM. EN, ON WN, NM mh. NNWN NNWN vos Patented Jan. 57, 1926.

UNITED sra'rlszs PATENToFFi GUSTAF A. OIJIN, OF WORCESTER,MASSACHTJ'SETTE.r

SURFACING TOOL.

To all whom z't may concern.'

Be it known thatV I, (Srtnsuar A. OLIN, a citizen of the United States,residing at Worcester, in the 'county of Worcester and Commonwealth ofMassachusetts, have invented new and. useful Improvements in SurfacingTools, of which the following is a specification.

This invention relates to improvements in. surfacing tools, and hasparticular reference to a novel and improved tool for use in laterallyfacing off or surfacing abrasive lWheels, or the like.

In my co-pending application Serial Number 708,921 filed April 25, 1924,I have illustrated a machine for use in such work, in which the wheel,disk or the like to be surfaced is given a rotary movement about itsaxis Awhile the surfacing tool is given` a, movement over the lateralsurface of the workpiece in a direction at right angles to the axis ofrotation thereof and is also radually kfed in toward the workpiece as te surfacing operation proceeds.l The tool forming the subject matter ofthe present invention is particularly `adapted for use with said machineand is illustrated as so fused in the application aforesaid.

In performing vwork of this character, diiliculties have beenexperiencedin the past due to the lateral as well as the endwise thrusts impartedto the tool spindle, the changing directionlof saidy thrust impulses,and to the working of abrasive powder resulting fromk the,v work intothe spindle-i bearings, causing rapid wear and deterioration oftheparts.

l It is,V the purpose of the present invention to obviate thediiiiculties experienced with the structures of the prior art and toprovide an improved surfacing tool which will satisfactorily resist ltheseveral strains to which it is subjected, ywhich will prevent access ofabrasive particles to the working parts thereof, and which will permit`ofi ready lubrication and adjustment of the several parts thereof. f

A .further object of the invention. is to preventbreakage' of reitherthe tool or the workpiece on account of the usual rigid holding of theparts, which result is accomplished by adapting'the parts of the toolfor limited relative yielding movement.

One structure for the attainment of these` )Vbjectsl is illustrated finthe vaccompanying` drawings. Briefly considered it comprises an outershell or holder and an inner spindle.'

Intermediate the spindle and shell are antifriction bearings tok takeupv the lateral strains directed againstthe spindle, and in` additionend thrust bearings are provided to care for the endthrust of thepressure of feeding the device against they work. In the preferred formof the 4device the end kthrust bearings are resiliently supported toyield underfundue. Strain and .thus prevent breaking of either thetool.or work., Means are provided to vary the resilient pressure of thebearings so that said pressure may be reduced as desired according to`the breaking strain ofv the` other parts so that the pressure will atalltimes be less than said amount. f

The spindle is provided with a head portion for engagement withthesurfacing; cup or disk, andadjacent said head has annular membersinterlocking with corresponding members on the shell to form a labyrinthwhich Will permit of free rotation of the spindle but will exclude dustor abrasive particles to a maximum degree. Additional means are providedto rotect the bearings from wear, and still ot er means for preventingany possible wear of the main spindle, and the several parts are soassembled that in case of wear the parts which have become worn may bereadily removed and replaced. s

Figure 1 is a longitudinal sectionalview of the invention.,

Figure 2 is a fragmentary sectional view of a modified form of springadjusting mechanism. Y

Figure 3 is a detailed view of the nut locking device employed linFigure l.

In the drawings, the numeral 10 designates the outer shell of the toolhaving the exteriorly threaded portion 11 atv one end and the interiorlythreaded portion 12 Vat the other. Disposed within the shellis the theroller bearings 19-20 which encircle the '105 enlargements 1415 of thespindle.

The shell 10 has enlargedshouldered recesses 2l-22 which receive'theouter portion of theroller bearings. A washer 23 preferably ojfhardenedmaterial encircles `the en- 11.0

largement 24 of the spindle and bears against the Jforward` end of thebearing 19 to provide a seal therefor and retain it in position. A capmember 25 is screwed onto the portion ll of the shell and has a.shoulder 26 engaging the Washer and locking it and thus the bearing inposition.

Forwardly of the portion 24 the spindle has an enlarged head 27,providing a seat 28 for the Work engaging cup or disk 29. This cup 29 isdesigned to engage the workpiece 30at an angle thereto, as indicated,and to be driven by the trictional engagement thereof with the rotatingworkpiece, the tool in its travel overthe surface of theworkpieceexerting. a combined twisting or grinding and scraping orgouging action onthe Work removing the irregularities therefrom to forma final relatively smooth even surface. @A suitable screw device such asindicated. atl 3l may be employed to secure the cupto the head' of thespindle. lt will also be understood that it desired, in place ofdepending on the friction drive the spindle may be positively driven, asby application ofA a driving belt to the head 2T or by mounting of aspecial belt-pulley thereon.

In any event, to prevent access of the abrasive particles removed'during the surfacing operation tothe spindle and its bearings, Ipreferably secure on the head 27 a collar 32 having an annular rib 33fitting into the groove 34' in the cap 25, the parts in question thusforming a labyrinth permitting of free relative rotation of the partsWithout friction or binding while excluding the dirt and-- dustparticles.

At the rear, the spindle has a threaded end135 on which is engaged thenut 36 having a hub portion engaging the inner part of the rollerbearing 2O and having an outer portion clamping the washer 37 againstthe shoulderl of recess 22 to properly retain the outer portion oi. thebearing. The shell has an aperture 38 normally sealed bythe screw 39which permits access to the periphery of nut 36 for adjustment thereof-When the device is assembled.

Rearwardly oi the nut 36 is a lock nut member jlOVhaving a flange ilengaging the nut 36. This liange forms a seat Afor the lineal thrustbearing l2 which encircles the body of the nut. The free face of thisbearing is engaged by the spring 43 contained Within the cap 44 whichscrews into the portion l2 of the shell,l the pressure of the springagainst the bea-ring beinO regulated byV screwing or unscreiving of thecap for the purpose heretofore described.

The nut 3G may-be employed as a check or lock-nut to retain the nut indesired position longitudinally of the spindle, and in addition. the nut40l may be slotted as indicated. in Figure- 3. In this event-,a screw1;5* serveto-spreadlthe two parts-of thenut at the slot 46 to cause themto bind against the thread on the spindle and resist accidental relativerotation of the parts.

The structure shown in Figure 2 is a slight variation of that justdescribed, in that the nut i7 on the spindle 235 has a hub 48 to engagethe inner portion oi' bearing 2O and a slight flange el?) aii'ording aseat for the thrust bearing- 50. The outer edge of this bearing engagesthe retaining washer 51 for the outer portion of bearing 2U, whilebearing is retained in place on nut ai? by a second lock-nut 52. Spring53 contained within cap 54 encircles nut 52 and exerts its pressureagainst the bearing 50. This pressure is controlled both by adjustmentof the cap :il and by variance in the position of its abutment Washer 55as shifted by the screw 56 in the cap. A nut 57 serves to loekthesci-evi7 in desired adjustment.

F rom the foregoing it will'be seen that the spindle is supported forfree rotation on antiifriction bearings which will take up both lateraland end thrust strains thereagainst, that the rear bearings arepositively sealed against dust and dirt and the front bearing protectedto a. maximum degree, that the parts are readily accessible foradjustment or replacement and may be lubricated through the apertures 38and 59.

I claim.:

l. A surfacing tool of the character described, comprising a shell,antifriction bearings Within the shell, a spindle journaled insaid'bearings and having one end projecting from the shell to receive awork engaging member, a shouldered portion on the opposite end ofthespindle, a. thrust bearing cooperating with said shoulder, a cap Vforthe end of the shell proximate to said bearing, and resilient meansintermediate the cap and the bearing for yieldingly 'forcing the bearingagainst the shouldered portion on the spindle.

2. A device of the character described, comprising a spindle having ahead at one end and a threaded portion at the other, annularantitriction bearings surrounding the spindle at spaced points, a sleevemember enclosing the intermediate portion of the spindle and holding thebearings in spaced relation, a shell enclosing the parts having seatsfor the bearings, a iianged member adjustably mounted on the threadedportion of the spindle, means 'for locking said member in adjustedposition, a thrust bearing' engaging said member. a cap adjustablyengaging the shell adjacent said bearing, and a compression springinterposed between the cap and bearing, whereb v the pressure of thespring against the bearing is varied b v adjustment oi the cap withrespect to the shell.

3. A tool for the purpose described, coinprisingl an outer shell havinga bearing. seat near each end and having an exteriorly threaded portionat one end and an interiorly threaded portion at the opposite end7annular bearings in the seats, a spindle journaled in the bearings andhaving a head at the exterorly threaded end of the shell and a threadedportion contained within the opposite end of the shell, the head havinga bearing-retaining portion, a second bearing engaging member mounted onthe threaded portion of the spindle and engaging the bearing to retainthe spindle Within the shell, a lock member on the threaded portion ofthe spindle having an annular flange contacting with the bearingengaging member, athrust bearing mounted on the lock member, a retainingspring therefor, and cap members forming closures for the ends `of theshell interlocking' with the threaded ends thereof, one of said capineinbers having a. portion engaging the spring and the other cap memberintertting with kthe head of the spindle, whereby said cap .membersexclude dirt particles fromy the interior of the shell.

GUSTAF A. OLIN.

